The Chinese authorities have said a relatively strong aftershock has shaken the waters of Tangjiashan lake, created by the earthquake in Sichuan province last month.
Efforts are continuing to prevent the lake from bursting its dam, threatening more than a million residents and a pipeline downstream.
Latest reports say Tangjiashan's waters are still rising faster than they can be diverted through newly-created channels.
The army has been firing anti-tank weapons at the dam, in addition to using more traditional explosives and bulldozers, to clear away rocks and mud, and to create extra channels.
About 250,000 people have been moved to higher ground from the lake's immediate surroundings in case the dam bursts.
Tangjiashan is the largest of more than 30 quake lakes created by the 7.9-magnitude earthquake on 12 May. Stemming the rise of water levels in each of them has become a priority for the government.
Latest government figures put the death toll from the earthquake at 69,136 with another 17,686 people missing. More than five million people are homeless.
The authorities estimate that thousands of those killed were children. Despite government promises, many parents fear there will not be a proper investigation into why so many schools collapsed.
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